﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Demo4
{
    class Shape
    {
        protected string color;
        public string Color {
            get { return this.color; }
            set { this.color = value; }

           
        
        }
        public virtual void GetArea(double a) { 
        }

    }
}
